fix the ToC

Author: boris-bazilevskiy

articles/communication-services/toc.yml

@@ -326,16 +326,14 @@ items:
         href: concepts/analytics/insights/chat-insights.md
       - name: Export SDK telemetry to Application Insights
         href: quickstarts/telemetry-application-insights.md
-    - name: Phone calling
+  - name: Phone calling
+    items:
+    - name: Add emergency calling to your app
+      href: quickstarts/telephony/emergency-calling.md
+    - name: Phone numbers
       items:
-      - name: Add emergency calling to your app
-        href: quickstarts/telephony/emergency-calling.md
-      - name: Validate a domain for direct routing
-        href: how-tos/telephony/domain-validation.md
-      - name: Phone numbers
-        items:
-        - name: Port a phone number into Azure
-          href: quickstarts/telephony/port-phone-number.md
+      - name: Port a phone number into Azure
+        href: quickstarts/telephony/port-phone-number.md
     - name: Call Automation
       items:
       - name: Build a workflow for customer interactions